Incomplete dominance Heredity Patterns Complete dominance Incomplete dominance

Incomplete dominance

Heredity Patterns

Complete dominance Incomplete dominance Heredity Patterns Codominance Multiple allelles Sex-linked Inheritance Polygenic Inheritance Multifactorial Inheritance

Cross a dominant red flowered plant with a white recessive flowered plant Cross a homozygous dominant red flowered plant with a white recessive flowered plant Cross a heterozygous red flowered plant with a white recessive flowered plant

In means NOT Incomplete dominance So incomplete dominance means NOT COMPLETE It shows a different phenotype

1. Cross a homozygous dominant black feathered chicken with a recessive white feathered chicken BB X bb all off spring will be Bb Codominance 2. Cross a heterozygous black feathered chicken with a recessive white feathered chicken Bb X bb

What does “CO”mean? Codominance So What do you think codominance mean? If I have a white feathered chicken and a black feathered chicken predict what you think the phenotype of the chick will be

Codominance Both alleles manifest seperately in the phenotype. A 3 rd alleles manifests which is a combination of both homozygotes. Both alleles contribute to the phenotype Example: A cross between a white cow and a brown cow which gives a combination of both colors WW X RR RW X

In chickens, black feather color (BB) is codominant to white feather color (WW). _____ X ____ What is the phenotype of the cross?

X

What are Codominance and Incomplete Dominance? Codominance – When BOTH alleles are expressed + Incomplete dominance – When a BLEND of both traits is expressed